Propelling apparatus for ships



Feb. 5, 1929. 1,700,913

H. TAWARA PROPELLING APPARATUS FOR SHIPS eddamh l0, 192'7 4 Sheets-Sheet 1 321g. Z. l 27 @nvm/tto@ Feb. 5, 1929. 1,700,913

H. 'rAwARA PROPBLLING APPARATUS FOR SHIYS Filed March l0, 1927 4 Sheets-Sheet 2 vwantoz l ly 7a M/a, ra.

Feb. 5, 1929.

H. TAWARA ROPELLING APPARATUS FOR SHIPS Filed March 10. 1927 4 Sheets-Sheet Feb. 5, 1929.

H. TAWARA PROPELLING APPARATUS FOR sHIs 4 Sheets-sheet 4 Filed March 10, 1927 Patented Feb. 5, 1929.

UNITED STATES HIKOSABURO TAWARA, OF HIROSHIMA CITY, JAPAN.

PROPELLING APPARATUS FOR SHIPS.

Application filed March 10, 1927, Serial This invention relates to a propelling apparatus and especially to a class suitable to be arranged inside the hull of ships and has for its object to propose a propelling apparatos in which astcrn movement is obtained without reversing the rotation of the main driving shaft with utmost efficiency. The invention is mostly applicable for shallow draught ships. For this purpose a device for S'J sweeping off sea weed etc., which will choke the suction pipe for the water, is also provided in this invention. The astern propelling is carried out by operating astern board only and the action of which is completed by aid of a gi'lide plate arranged inside the delivery pipe.

1n the accompanying drawings, Figs. 1 to 10 show one example of the apparatus according to this invention and in which:

Fig. 1 is a vert-ical longitudinal section,

Fig. 2 is a plan view, partly in section,

Fig. 3 is a vertical transverse section` Fig. 4 is a detailed sectional view showing attachment of a guide plate,

Fig. 5 is a horiyontal section of an astern board attachment,

6 and 7 are sectional views of respectively single and double type astern boards,

Fig. 8 is enlarged sectional view showing detail of a grate employed in this invention,

Fig. 9 is the front View of the grate, and

Fig. 10 is a section showing detail of grate operating parts,

Figs. 11 and 12 show another example of the apparatus according to the invention, and in which:

Fig. 11 is a` longitudinal section,

Fig. 12 is a plan view partly in section thereof.

Figure 13 is a vertical section of Figure 1.

Figure 14 is a view of a grate employed in this invention.

1n the first example shown in Figs. 1 to 10, 1 is a casing of the new propelling apparatus and to `which a cover 2 for a paddle wheel 3 is fitted. The wheel 3 is fixed to the shaft 4 at each end thereof by means of a nut 5. The shaft 4 is provided with a worm wheel 6 at the center' thereof, which is geared with a worm 7 on the main driving shaft 8 driven by a suitable motive power. At the outside of the rear slope of the casing 1 which forms a rear deliverv space, a casing 10 is provided to receive an astern board 9 which operates with the water moved by the pro mision meansI to give an aste-rn movement of the ship and at No. 174,348, and in Japan July 14, 1926:

the top of this Casing 10,21 detachable cover 11 is provided for inspection. This asternboard 9 may be single type as shown in Figs. 4 and 6, or double type as shown in Fig. 7, and is fixed to the shaft 12 provided with an operating handle 13. At one end 0f the shaft 12, an arm 13 is fitted and by which a guide board 16 for delivery water is operated through links 14 and 15.

At the fore part of the casing 1 forming suction space, a movable grate 17 and a fixed grate 19 are provided. The each end of this movable grate is pivoted to a shaft 18 fixed to the casing 1, while each end of the fixed grate is rigidly attached to the same shaft 18. The rods forming the movable grate and those forming the fixed grate are alternatively arranged. The fixed grate, however, may be replaced by a movable grate so that the whole grate is constituted by movable one. The each rod of the movable grate is jointed at the center pin 20 connected to an ol'ierating rod 21 (see Fig. 8). To the threaded top of the rod 21, a nut 22 is fitted, which is inserted to a slot of corresponding shape provided in the enlarged head of another rod 23 from one side of the slot, the rod 23 having an operating handle 26. 24 is a casing fixed to the casing 1 to receive the joints 21. 22, 23. and is covered by a cover nut 25. When the operating handle 26 is turned by nineteen degrees from the position shown in Fig. 8, the parts come to positions shown in Fig. l0, in which the longitudinal projections 23 provided in the enlarged head of the rod 23 engage to corresponding longitudinal slots 24 provided in the inner wall of the casing 24. Therefore, the rod 23 can be freely pulled in and out in the casing 24 so that the pivoted grate 17 is shaken to drop off' sea weed etc., as shown in Fig. 8. For this purpose, the joint of the each rod of the grate 17 is provided with an oblong slot. Vhen sea weed etc. are swept off. the rod 23 is pulled up and turned by nineteen degrees reversely so that the parts are again brought into fixed positions. 27 is an opening for cleaning the suction space. 28 is a side cover of the paddle wheel and serves also to the bearing of the shaft of the wheel. The bearing may be constituted of lignumvitae provided with a packing gland 30.

In the second example shown in Figs. 11 and 12, a suction pipe 31 is jointed to a delivery pipe 32 by clamping together -with their flanges, and a screw propel er 33 is arranged at the Center ot the joint. 34 is the shaft ol' the propeller and is driven by any convenient motive power. The suction .pipe is branched into tivo pipes as shown in Fig. 12. At the rear part ot the delivery pipe an astern board 9 is provided. This board 9 is fixed to a shat't 12 which is operated by the handle 13. In ahead propulsion, the board 9 is moved into its casing 10 ivhile in astern propulsion. it is projected into the position as shown in Fig. 10. At the opposite end of the shaft 1Q. an arm 1?/ is fitted which operates a guide plate 16 mounted to a pivoted shaft through links 14 and 15. lVhen the handle 13 is in astern position, the guide plate 16 will partly shut the exhaust pipe as shown in full line in Fig. 11, so that` the direction of Water passing lthrough the delivery pipe is directed to the corner ot an angle formed by the board 9 and the Casing of delivery pipe and promotes or makes easy the reversing movement ot the delivery Water. The bearing ot the main shatt 34 is provided at the joint of the t\vo branches et the suction pipe Where a lignumvit bearing 29 and a gland il() may be used. 2T is an opening for cleaning the propeller ete. The end of eaeh suction branch is ot course provided with the -grate apparatus as shown and described with reference to the tirst example although it is not shown in the tig-lires.

As will be easily understood from the above going, when the suetion pipe is choked by sea weed ete., Which is mostly met bv shalloiv draught ships, it is easily swept ott by simply pulling up and doivn the operating rod 23 and thereby projecting the movable grate in and out.

The astern board 9 may be single or double type. In the former. i notch 9" is provided at the corner ot an angle formed by the board and the casing 1, While in the lat-ter, a notch 9 is formed in the t'ore plate thereof only. Thus` in the single t pe. a part ot' the stream runs out ot' the notcli 9 while the majority ot the stream rims along the inner curve of the board. In the double type, a part of the stream running out ot the notch 9 will also run parallel to the rest of the stream running along inner Curve of the board. ln any ot .the types, the Water pocket, which the main ground ot detioiency of astern power. is enltirely obviated by providing such notehes. so that a ship can be efficiently propelled astern Without reversing the rotation ot the main shaft and accordingly without reversing the rotation of the main motor or engine. Further, by the provision ot a guide plate 16 in the exhaust passage, the direction of delivery stream is changed to be directed to the Corner of the angle formed by the astern board and the delivery casina so that reversing of the stream is made remarkably easy.

l claim:

1. A propelling' apparatus for ships. comprising a easing adapted to be secured to the bottom of a ship, said casing having an inlet and an outlet, a Water propelling means Within the casing whereby Water is moved through the easing, an astern board movable across the outlet, a movable guide plate arranged in the outlet to direct the water aga-inst the astern board and means to simultaneously operate the astern 'board and the guide plate lsubstantially as shown and described.

2. The propelling apparatus t'or ships as claimed in claim 1 and in Combination there- With, of a movable grate arranged in the inlet side of the casing.

3. The propelling apparatus for ships as Claimed in Claim 1 and in Combination therewith ot a easing secured to the outlet part oit the first mentioned casing and into which the astern board can be Withdrawn.

4. The propelling apparatus tor ships as claimed in dlaim 1 in which the astern board is provided with transverse slots.

5. The propelling apparatus ior ships as claimed `in claim 1 in whieh the :is-tern board comprises a tront member and a rear meniber, the `front member being provided with transverse slots.

In testimony Whereot I affix my signature.

HIKOSAsBURO TAVVARA.. 

